Stets, E.G., Kelly, V.J., Crawford, C.G., 2014, Long-term trends in alkalinity in large rivers of the conterminous US in relation to acidification, agriculture, and hydrologic modification: Science of The Total Environment, Volumes 488-489, 1 August 2014, p. 280-289. DOI: 10.1016/j.scitotenv.2014.04.054 Available Online

Stone, W.W., Gilliom, R.J., and Martin, J.D., 2014, An overview comparing results from two decades of monitoring for pesticides in the Nation's streams and rivers, 1992-2001 and 2002-2011: U.S. Geological Survey Scientific Investigations Report 2014-5154, 23 p. doi.org/10.3133/sir20145154 Available Online

Wieczorek, M.E., 2014, Area- and depth-weighted averages of selected SSURGO variables for the conterminous United States and District of Columbia: U.S. Geological Survey Data Series 866, Available Online